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One of 358/2 Days most appealing features is the new Multiplayer mode. The Multiplayer mode in 358/2 Days promises all of the members of Organization XIII available as playable characters, and may even include the new XIVth member. Although, it should be noted that all players will have to play as a unique character, meaning there can't be two Axels or two Xigbars playing at one time.
The Multiplayer mode takes place in a separate universe from the Single Player mode and isn't considered to be part of the games story and is only there for fun. Up to four people can play together as any Organization Member they choose as they work together to complete various missions, with some asking you to kill heartless, fight each-other, or even search for items.
The missions in Multiplayer are unlocked by beating the missions in Single Mode. Every time you complete a mission in Single Mode it is unlocked for playing in Multiplayer mode.
These missions include things such as defeating Heartless, and escaping from Areas via teamwork. They are also set to include a lot of gimmicks and puzzles and that the map will be used to keep track of things as well. Many of the missions are designed for short play throughs in Multiplayer and they can be played multiple times. They also mentioned that Scores will be kept on various things during Multiplayer, such as "attack". But they also stress that working together is not the only thing you can do and that there is great potential for waging a competition or contest.
Also, when you complete missions in Multiplayer, the experience you gain from completing those tasks are given to Roxas in Single Mode. For example, if you were to play as Axel and do a few missions in Multiplayer mode, the experience you gained from doing that would affect your Single Mode file.
They have also said that they are thinking of an item system that works in a similar fashion.
Also in Multiplayer Mode, the bottom screen is being revamped from Single Mode to offer the ability to chat to other players by use of the Nintendo DS Stylus. This chatting system will differ from PictoChat in that all of the players will write on the same screen. Nomura and co are also considering adding a few action buttons to the screen, but noted that these would be for actions that didn't affect gameplay.
Nomura has also added that they are thinking of missions that will implement this chat feature.
Also, the Limit Gauge from Single Mode will make a reappearance, allowing for co-op techniques to be used. Originally the chairs of the Organization Members would move up or down based on succeeding or failing a mission, but they may change that feature for the final product release.
However, in the latest Shonen Jump Scans there is a screenshot of Roxas and Xaldin in a new world to 358/2 Days (
See Here), and the Limit Gauge and MP bars have mysteriously vanished. There is also a new "Chains!" counter in the top left of the screen but whether or not these changes are only mission-specific additions/changes has yet to be seen.